Windshield wiper operating means



March 22, 1938. w. L. HOBURG n AL 2,112,196

WINDSHIELD WIPER OPI'RA'IIIIG MANS Filed Sept. 19,l 1955 `2 Sheets-Sheet l INVENTORS MM .JC

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March 22, 1938; 'w. L. HOBURG ET AL 2,112,196

WINDSHIELD WIPER OPERATING MEANS Filed sept. 19, 1935 2 sneets-sheet 2 Patented Mar. 22, 193s WINDSHIELD WIPER. OPERATING )MEANS William L.'.H'oburg, Glenshaw,.Robert L.vMc-` Candless,` Mars, and Edward A. Berry, Pittsborghi Pa'., assignors, by direct and mesne assignments, to said Hoburg T,

Application Our invention relates to automatic fluid pressure actuated windshield wiper operating means. The commonly known and popular type of windshield wiper motor, which is actuated by the difference in 'pressures between suction ina ductleading directly fromy the engine intake manifold and air at substantially normal atmospheric pressure, does not operate'successfully under all conditions of operation of the motor vehicle to which it is attached. It is well known that the suction lin the intake system of a combustion engine is irregular and varies widely between the times when the throttle of the engine is open and, when it is closed and under certain conditions of opera- 15, tion, the dilerence in pressures between the suction and atmospheric pressure is insufficient to actuate the windshield motor; Our device employs not only the suction of the motor, as aforesaid, but, also, the pressure in the exl'iaust system, and we have found that under all conditions of operation of the engine, the windshield motor will function positively and satisfactorily.

According to the present invention, there is provided a fluid actuated uni-directional motor having connections through which motion is transmitted to a wiper blade to oscillate it.

, The motor is of a type in which a disc is mounted centrally upon a sphere which is seated in a spherical bearing formed at the convergence .of 30 two conical walls of an enclosing chamber having spherical side walls. The disc is arranged so that it will gyrate or rock circularly in a 'tilting or wabbling motion. The piston or disc is actuated by the dierence in pressure between the suction' in a duct leading directly from the engine intake system and pressure in a duct leadingfrcm the exhaust system to the wiper motor.

In the accompanying drawings, illustrating the present preferred Yembodiment, of our invention, 40V and in which like numerals are employed to desigv nate corresponding parts throughout the same,

Figure 1 is a top plan view of the apparatus; Figure 2 is a view in side elevation of the apparatus; .Y

Figure 3 is a crosssectional view along the lines III-111 of Figure 1; Figure'4 is a vplan view of the motor with one section of the casing or housing removed;

Figure 5 is a top plan view of a modification of the apparatus; 4

Figure 6 is a view in side elevation of the appa- `ratus showninFigure 5;

Figure'l is a detail of a valve, for use with the apparatus;

Figure 8 is` 4a sectional view Aalongthe line VIII-VDI of-Figure 7; and

`Figure 9 isv a view vof one form of the apparatus mounted in position on a windshi e1d.

Inth drawings, II) designates a huid-actuated 60 motor, in which an actuating disc or piston II -is 1otdisc II.

september-19, 1935, sciame. 41,262 40mm.' (01,121-69) disposed within a chamber I2. The end walls I3 and I4 of the chamber have a `truncated cone shape and the side wall I5 is a surface of revolution generated by a spherical arc.` vThe motor casing or housing may be conveniently made in two parts I 6 and I 'I and fastened together by screws I8. Lugs Ila and Ilb are provided whereby the motor may be attached to the windshield frame.' l

The disc II is secured in a diametric'al position upon a spherical member or bearing ball I3, whichl is seated in' the bearings 20 and 2l formed on the conically converging end walls I3 and It. A

"spindle 22 projectsradially from the hall I3 outwarclly and at right angles to the horizontal plane The outwardly projecting end 23 of the spindle is Yrestrained by' the frusto-conical guide member 24 secured to the cover plate 25, so *as to cause the spindle to move in a uni-directional circular path. Journaled axially on member A2li will cause shaft 22 to move counterclockwise and will press against lever f2'I and thus turn shaft 26,

which. in will oscillate .the blade' through connections lafter-to be described. The opposite enc'li of the shaft is secured to means, which we shall hereinafter describe, which -are suitable for transmitting the motion fof shaft 26 to the desired point of application. The disc II4 is prevented from rotating in its own 'plane about its vertical axis by a partition 28 which extends transversely between the end walls I3 and I4 and radially nom the side wan to the han is. The 'partition passes through a radial slot 29 in the disc. 'Ihe adjoining walls of the disc are shaped so that there is a working t between the partition and the side walls of the slot in all positions, and there is a working fit between the spherical side walls of the chamber I2 and disc I I.

Formed in the sidewall I5 of chamber I2 are openings 30 and 3 I Opening 3D is connected to a suitable pipe o r duct 32 leading to the exhaust system ofv the motor (not shown) whileopening 3l may be connected by means of a suitable pipe or duct 33 to the intake system of the engine (not shown) The openings 30 and 3l are disposed on opposite sides of the partition 28. The pipes or` ducts 32 and 33 have a control valve 34 (illustrated in Figures 5, 7, and 8) connected to both. I

The control valve 34 has a shell portion 35 in v which is fitted a plug 36 controlled by handle 31. f

, nects opening Bland opening 30, while one porisa shaft 26 whichA has at one end a lever member 1 I 2l secured thereto. The disc Il when actuated tion of the duct 33 connects opening 40 and opening 3|.

When the valve 24 is open pressure from thel exhaust system will pass through pipe 62, and opening 30 into chamber I2 to the right of partition 28 and above disc Il (when the disc is in the position illustrated in Figures 2 and 6) and then sweep around the disc and out through opening 3l, thence through pipe 33 to the intake system. 'I'his will cause the disc Il to move in a gyratory direction just like a top which is about to stop spinning and will communicatecoimterclockwise rotary motion to shaft 26. If it is desirable that the shaft 26 turn in a clockwise direction, it is only necessary to connect opening 3| to the exhaust system and opening 30 tothe intake system In Figures'l, 2, and 3 there is illustrated a Windshield wiper motor to the top plate 25 of which the windshield wiper shaft 44 is connected. This shaft has fastened thereto the wiper arm 45 to which the wiper` blade (not shown) is attached. Shaft 44 moves in an oscillatory fashion and consequently the wiper arm 'and attached wiper blade are moved trough'the desired arc. `The shaft 44 is journaled in the top or cover plate 25 and has fastened to it a leverU 46 which in turn is pivotally connected by link 41 to the disc or plate 48, which is secured to the outer end of shaft 26. Rotation of shaft 26 and plate 48 will cause the shaft 44 to oscillate and move the wiper arm 45 back and forth in a sweeping arc. l

Another form of crank and rocker driving connection between the motor and the wiper blade is illustrated in Figures 5, 6, and '7. In this modication, the shaft 26 has secured thereto an arm 49 which, when the motor is operating, travels in a uni-directional circular path. The end 50 of arm 49 distant from driving shaft 26 is pivotally connected to one end of a rod 5|, the other end of which is plvotally connected to the wiper arm 52 which'in turn is'pivotally fastened by bracket 53 to windshield frame 54. Similarly, arm 49 is connected to wiper arm 55 by rod 56. 0f course, the arrangement will work equally well when connected to one windshield wiper arm or to more than one.

When it is desired to operate the wiper,iwhich, of course, will operate only when the car engine is running, the valve arm 31 is turned toy the position sho in Figure 5. This places one side of the disc l in communication with the exhaust system by. way of pipe 32 and pressure above atmospheric will be exerted on the disc and this pressure added to that. caused by the less than atmospheric pressure on the opposite side of the disc, due to the Vless than atmospheric pressure in the intake manifold, to .which it is connected through `communicating pipe 33, will cause the disc Il to gyrate. 'I'he shaft 26 will then turn 'counterclockwise and move lever arm 21, shaft 26 to which it is attach d and through the linkage 41 and arm 46, see gure 1, will cause shaft 44 to oscillate and move the wiper blade attached to wiper arm 45 back and forth in an arc. In the modification shown in Figure 5, the turning 'of f shaft 26 will cause arm 49 to move counterclock- By our invention, we have provided a simpleI and satisfactory windshield wiper and one in which the motor is simple and positive in opera.- tion Vunder allconditions 'of operation of the engine to which it is connected.. The apparatus has no valves to get out of order and is thoroughly dependable and powerful, and withal compact and economical to manufacture.

While we have shown and speciiically described certain present preferred embodiments of our invention, it will be understood that the invention may be otherwise constructed and embodied within the scope of the following claims.

We claim: t Y

1. Operating means for a windshield wiper of a combustion engine driven vehicle, comprising a uid pressure motor of the type having a wabbling diaphragm which is progressively tilted in a gyratory manner to produce unidirectional rotary motion and having opposed fluid pressure connections, one leading to the exhaust system and one leading to the intake system of the engine which drives said vehicle, means for transmitting said rotary motion of the diaphragm to the wiper as oscillatory motion, and means for simultaneously controlling said connections.

2. Operating means fon a windshield wiper of a combustion engine driven vehicle, comprising a fluid pressure motor having opposed fluid pressure connections, one leading to the exhaust system of the engine which drives said vehicle, said motor being of the typeI having a wabbling diaphragm which is progressively operated to produce uni- 'directional gyratory motion, means for preventing the disc from rotating about -its axis, and means for simultaneously controlling said connections.

3. Operating means for a windshield wiper of a combustion engine driven vehicle. comprising a lfluid pressure motor, said motor having a chamber with two inwardly inclined conic heads and arcuate side walls, a bearing ball received in said chamber, a disc diametrically positioned upon the bearing ball and extending between the side walls, a radial partition extending from the bearing to the side walls and from one conic wall to the other, said disc having an 'opening therein through which said partition passes, fluid pres- .sure connections, one leading to the exhaust syschamber with two inwardly inclined conic heads,-

an actuating disc in said chamber adapted to rock in a progressively tilting motion to produce uni-directional rotary lmotion, means passing through said disk for preventing it from rotating about its axis, said chamber having an opening in either side of said means and 'on opposite sides of the disc, a fluid pressure connection from one of said openings to the intake system of the engine, a fluid pressure connection from the other of said openings to the exhaust system of 'the' engine, and means for simultaneously controlling both of said connections.

WILLIAM L. .HOBURG. ROBERT L. MCCAN'DLESS. EDWARD A. BERRY. 

